Kelly I found that out about synto and PPH after I had Grace. My mum was actually told that by an OB at her hospital as she mentioned my case to him - she told him I had had two previous PPH and his response was "Did she have synto?".
If I had known that before I would not have agreed to be augmented with her. I actually didn't think that it would happen again after I had Harry - I put it down to the difficult birth I had with him so I didn't think it to be a concern the 2nd time around. I have been told that the cannula is a precaution so that if need be they can shoot me up quickly after giving birth. Both times I started hemorrhaging straight away pretty much, so I figure if I don't have synto during labour then after I give birth if I don't start to bleed profusely then they won't need to use the cannula. But I will need to clarify all this with the midwife on friday. Maybe a natural 3rd stage could be an option, although I know that the hospital would not be in favour of it.